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<div class="d-none d-xl-block col-xl-2 bd-toc">
            <ul class="section-nav">
<li class="toc-entry toc-h2"><a href="#relative-to-the-parent">相对于父级</a></li>
<li class="toc-entry toc-h2"><a href="#relative-to-the-viewport">相对于窗口</a></li>
</ul>
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<main class="col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
  <h1 class="bd-title" id="content">规格与尺寸(Sizing)</h1>
  <p class="bd-lead">使用系统宽度和高度样式，轻松地定义任何元素的宽或高（相对于其父级）。</p>
   
  <h2 id="relative-to-the-parent"><span class="bd-content-title">相对于父级</span></h2>
  <p>宽度和高度通用属性从 <code class="highlighter-rouge">_variables.scss</code>的 <code class="highlighter-rouge">$sizes</code> Sass map 中产生，默认值包括 <code class="highlighter-rouge">25%</code>、<code class="highlighter-rouge">50%</code>、<code class="highlighter-rouge">75%</code>、 <code class="highlighter-rouge">100%</code> ，你可根据整这些值，从而生产出不同的规格属性。</p>
<div class="bd-example">
<div class="w-25 p-3" style="background-color: #eee;">Width 25%</div>
<div class="w-50 p-3" style="background-color: #eee;">Width 50%</div>
<div class="w-75 p-3" style="background-color: #eee;">Width 75%</div>
<div class="w-100 p-3" style="background-color: #eee;">Width 100%</div>
<div class="w-auto p-3" style="background-color: #eee;">Width auto</div>
</div>
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"w-25 p-3"</span> <span class="na">style=</span><span class="s">"background-color: #eee;"</span><span class="nt">&gt;</span>Width 25%<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"w-50 p-3"</span> <span class="na">style=</span><span class="s">"background-color: #eee;"</span><span class="nt">&gt;</span>Width 50%<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"w-75 p-3"</span> <span class="na">style=</span><span class="s">"background-color: #eee;"</span><span class="nt">&gt;</span>Width 75%<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"w-100 p-3"</span> <span class="na">style=</span><span class="s">"background-color: #eee;"</span><span class="nt">&gt;</span>Width 100%<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"w-auto p-3"</span> <span class="na">style=</span><span class="s">"background-color: #eee;"</span><span class="nt">&gt;</span>Width auto<span class="nt">&lt;/div&gt;</span></code></pre></figure>
  <div class="bd-example">
    <div style="height: 100px; background-color: rgba(255,0,0,0.1);">
      <div class="h-25 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 25%</div>
      <div class="h-50 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 50%</div>
      <div class="h-75 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 75%</div>
      <div class="h-100 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 100%</div>
    </div>
  </div>
  <div class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;div</span> <span class="na">style=</span><span class="s">"height: 100px; background-color: rgba(255,0,0,0.1);"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"h-25 d-inline-block"</span> <span class="na">style=</span><span class="s">"width: 120px; background-color: rgba(0,0,255,.1)"</span><span class="nt">&gt;</span>Height 25%<span class="nt">&lt;/div&gt;</span>
  <span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"h-50 d-inline-block"</span> <span class="na">style=</span><span class="s">"width: 120px; background-color: rgba(0,0,255,.1)"</span><span class="nt">&gt;</span>Height 50%<span class="nt">&lt;/div&gt;</span>
  <span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"h-75 d-inline-block"</span> <span class="na">style=</span><span class="s">"width: 120px; background-color: rgba(0,0,255,.1)"</span><span class="nt">&gt;</span>Height 75%<span class="nt">&lt;/div&gt;</span>
  <span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"h-100 d-inline-block"</span> <span class="na">style=</span><span class="s">"width: 120px; background-color: rgba(0,0,255,.1)"</span><span class="nt">&gt;</span>Height 100%<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;/div&gt;</span></code></pre>
  </div>
  <p>你也可使用<code class="highlighter-rouge">max-width: 100%;</code> 和 <code class="highlighter-rouge">max-height: 100%;</code> 这些通用样式定义。</p>
  <div class="bd-example"> <svg class="bd-placeholder-img mw-100" width="100%" height="100" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: Max-width 100%"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">Max-width 100%</text></svg> </div>
  <div class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;img</span> <span class="na">class=</span><span class="s">"mw-100"</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">alt=</span><span class="s">"Max-width 100%"</span><span class="nt">&gt;</span></code></pre>
  </div>
  <div class="bd-example">
    <div style="height: 100px; background-color: rgba(255,0,0,0.1);">
      <div class="mh-100" style="width: 100px; height: 200px; background-color: rgba(0,0,255,0.1);">Max-height 100%</div>
    </div>
  </div>
  <div class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;div</span> <span class="na">style=</span><span class="s">"height: 100px; background-color: rgba(255,0,0,0.1);"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"mh-100"</span> <span class="na">style=</span><span class="s">"width: 100px; height: 200px; background-color: rgba(0,0,255,0.1);"</span><span class="nt">&gt;</span>Max-height 100%<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;/div&gt;</span></code></pre>
  </div>
  <h2 id="relative-to-the-viewport"><span class="bd-content-title">相对于窗口</span></h2>
  <figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"min-vw-100"</span><span class="nt">&gt;</span>Min-width 100vw<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"min-vh-100"</span><span class="nt">&gt;</span>Min-height 100vh<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"vw-100"</span><span class="nt">&gt;</span>Width 100vw<span class="nt">&lt;/div&gt;</span>
<span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"vh-100"</span><span class="nt">&gt;</span>Height 100vh<span class="nt">&lt;/div&gt;</span></code></pre></figure>
  
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